JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II BASIC ELECTRICAL ENGINEERING Previous Question Paper (April/May - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Define Kirchoff’s current law.
Answer
Kirchhoff’s Current Law (KCL) states that the algebraic sum of currents entering a node (or a junction) in an electrical circuit is zero. Alternatively, it can be stated as the sum of currents entering a junction is equal to the sum of currents leaving that junction, which is a direct consequence of the principle of conservation of charge.
What are the types of sources? Give examples.
Answer
Electrical sources are classified into two main categories based on their ability to maintain voltage or current:
- Independent Sources: These sources provide a specified voltage or current that is completely independent of any other element in the circuit. Examples include batteries, DC power supplies, and signal generators.
- Dependent (Controlled) Sources: These sources provide a voltage or current whose value depends on the voltage or current elsewhere in the circuit. They are represented by diamond-shaped symbols and are common in models of transistors and operational amplifiers.
Each of these can be further categorized as either a Voltage Source, which maintains a terminal voltage, or a Current Source, which maintains a specific current flow.
Define form factor of a sinusoidal waveform.
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What is J operator? Explain its significance.
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Define leakage flux.
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Define eddy current loss. How to reduce this in a single phase transformer?
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What is slip of 3-phase induction motor?
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What is a DC series motor? Draw the circuit diagram of dc series motor.
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What is the need for damping torque in measuring instrument?
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List out various instruments used to measure voltage, current and power.
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Part B
Discuss in detail about the start to delta conversion of resistive circuits in the suitable example.
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Using thevenin’s theorem, find the current ‘I’ in the circuit below.
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State and explain superposition theorem.
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Find the maximum power delivered to the load resistor ‘R’ using maximum power transfer theorem.
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Derive the expression for average value and form factor of a sinusoidal waveform whose amplitude is A and whose time period is T.
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Simplify the following expression: 1∠0º + 2∠90º + 3∠-90º
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Derive an expression for current flowing through a capacitor when it is subjected by A.C source of v = Vm sin(ωt).
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Find the impedance and current of R-L series circuit having R=10 Ω ; L=50 mH connected across 230V, 50Hz supply.
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Explain the constructional details of single phase transformer
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A 10 KVA single phase transformer has an efficiency of 98% at Full Load and also at Half Load. The power factor is unity in both cases. Find the efficiency of the transformer at 70% Load.
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Derive the expression for the voltage regulation of single phase transformer for lagging load
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For the ideal transformer shown below, find the currents I1, I2 and V.
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Explain the principle of operation of DC generator.
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Discuss in detail about different losses in DC motors.
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Discuss in detail about the working of three phase induction motor.
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Obtain the torque equation of d.c motors.
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Give the detailed classification of instruments.
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Explain the working of moving iron voltmeter.
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Explain the basic working principle of Permanent Magnet Moving Coil (PMMC) instruments.
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What are the advantages and limitations of Permanent Magnet Moving Coil (PMMC) instruments?
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